lit 12] on Iccbenjs and their Location in Navigation. 527 



the ice melts it cools the salt water, which sinks down by convection. 

 (*2) A stream of warmer salt water moves in towards the ice, 

 giving rise to a horizontal cnrrent. (3) The melted ice consists 

 of fresh water, which does not mix with the salt water on account 



of the difference of density. This fresh water rises around the ice 

 and spreads out over the surface. The ice becomes surrounded by 

 a layer of fresher water, which tends to remain on the surface. As 

 the ice moves the fresh water moves with it. Waves do not mix it 



